Our good friend Giovanni is correct in his assumption that we are more familiar with ASTM specifications.

In general, cast steel will weld as good or as poorly as a wrought steel of similar composition. Some cast steel tend to be on the high side of sulfur content, so make sure the manganese content of the filler metal maintains a manganese to sulfur ratio of 10/1, that is, the manganese content has to be ten times higher than the sulfur content.

Preheat should be calculated based on carbon equivalency. Also, due consideration must be given for the introduction of diffusible hydrogen into the weld puddle by the welding process, i.e., use a low hydrogen electrode, and the degree of restrain due to the thickness of the material and connection details.

If this is a repair, obtaining the chemical analysis of a sample taken from the actual casting is always a worth while exercise. The ranges of chemistry of cast materials are often more liberal than for rolled or wrought products.

Best regards - Al